Don’t eyeball your gas block installation.
Mic the distance from the barrel shoulder to the start of the gas port. Now mic the distance from the back of the gas block to the start of the gas hole. You will more than likely have a 0.02-0.03” difference.
Use a feeler guague up against the barrel shoulder to ensure correct offset.
Another trick is to cut the end of a toothpick and drop it into the gas block hole (make sure your gas metering screw is all the way out). Position the barrel with the gas port facing down then slip the gas block on upside down. Turn the assembly right side up and look down the bore. Wiggle the gas block around. When the holes are aligned the toothpick will drop from the gas block into the barrel. Tighten gas block. The toothpick piece should fall out of the barrel, if not use a rod to push it out. All done and gas block will be perfectly aligned.
Mick

That is pretty sad if true. The Colt 9mm AR was designed around a regular mil-spec upper, so if an upper receiver maker can't get something as basic as the bolt bore correct then they have quality issues.
Mick